25433278991 has 2 divisors, whose sum is σ = 25433278992. Its totient is φ = 25433278990.

The previous prime is 25433278979. The next prime is 25433279023. The reversal of 25433278991 is 19987233452.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 25433278991 - 2²⁶ = 25366170127 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25433278391) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12716639495 + 12716639496.

It is an arithmetic number, because the mean of its divisors is an integer number (12716639496).

Almost surely, 2^25433278991 is an apocalyptic number.

25433278991 is a deficient number, since it is larger than the sum of its proper divisors (1).

25433278991 is an equidigital number, since it uses as much as digits as its factorization.

25433278991 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3265920, while the sum is 53.

The spelling of 25433278991 in words is "twenty-five billion, four hundred thirty-three million, two hundred seventy-eight thousand, nine hundred ninety-one".